Bicycle frame



FIG. 1 is a perspective view of a bicycle frame embodying our new design;

FIG. 2 is a side elevational view of the bicycle frame of FIG. 1;

FIG. 3 is a bottom plan view of the bicycle frame of FIG. 1;

FIG. 4 shows a cross section of the bicycle frame taken along line 4--4 of FIG. 2;

FIG. 5 shows a cross section of the bicycle frame taken along line 5--5 of FIG. 2; and,

FIG. 6 shows a cross section of the bicycle frame taken along line 6--6 of FIG. 2. 

The ornamental design for a bicycle frame, as shown and described. 